Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/1334
Title: Resetable over-current and/or over-temperature protection system
Authors: Lee, Yim-shu
Li, Jianqing
Chow, Martin H. L.
Siu, Kam-wah
Subjects: Electrical circuit over current protection
Electric circuit switch
Issue Date: 4-Nov-2008
Source: US Patent 7,446,643 B2. Washington, DC: US Patent and Trademark Office, 2008.
Abstract: An electrical protection system, which can be connected between an electrical power supply and an electrical load, firstly includes a switch switchable between a normal state in which the switch is electrically connected in series between the power supply and the load such that an operating current passes through the switch and the load, and a fault sate in which the switch is disconnected with the load such that no current passes through the load. The switch switches to the fault state in an over-current or an over-temperature situation. The system further includes a controller operable in an open state when the switch operates in the normal state, in which state the controller is electrically disconnected from the power supply such that no current passes through the controller, or a closed state when the switch operates in the fault state, in which state the controller is electrically connected in series between the switch and the power supply such that a self-holding current passes through the switch and the controller. The controller operates to automatically set the switch to the normal state when the self-holding current is off.
Rights: Assignee: The Hong Kong Polytechnic University.
Type: Patent
URI: http://hdl.handle.net/10397/1334
Appears in Collections:Patents of PolyU
EIE Patents

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